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Soewignjo Agus Nugroho
Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Veterinary

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KORELASI PARAMETER KUAT GESER TANAH HASIL PENGUJIAN TRIAKSIAL DAN UNCONFINED COMPRESSION STRENGTH (UCS) Soewignjo Agus Nugroho; Agus Ika Putra; Rugun Ermina
Jurnal Sains dan Teknologi Vol 11, No 1 (2012): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (686.129 KB) | DOI: 10.31258/jst.v11.n1.p%p

Abstract

Parameter kuat geser tanah diperlukan pada analisis daya dukung tanah, stabilitas lereng dan tekanan aktif pada dinding penahan tanah. Nilai parameter kuat geser tanah diperoleh dari uji geser di laboratorium, seperti Unconfined Compression Strength (UCS), Vane Shear, Direct Shear dan Triaxial. Setiap pengujian dapat menghasilkan nilai yang berbeda walaupun sampel uji pada kondisi yang sama. Pengujian triaksial sangat dianjurkan untuk menentukan parameter kuat geser tanah karena dapat disesuaikan dengan kondisi lapangan. Tetapi pelaksanaan pengujian triaksial membutuhkan ketelitian dan waktu yang lebih lama dibandingkan pengujian geser lainnya. Tujuan dari penelitian ini adalah mendapatkan suatu hubungan atau korelasi antara parameter kuat geser tanah yang dihasilkan dari pengujian triaksial dengan hasil pengujian UCS. Pada penelitian ini digunakan metode eksperimental dan model. Benda uji berupa campuran lempung/pasir yang dibentuk kembali, diberi pembebanan awal sehingga kondisi tidak terganggu. Untuk pengujian triaksial dan UCS digunakan benda uji dengan ukuran dan kondisi yang sama. Hasil pengujian dianalisis dengan regresi linier berganda antara dua hasil pengujian triaksial dan hasil pengujian UCS dengan dan indeks propertis tanah campuran. Hasil pengujian dan analisis menunjukkan ada korelasi kuat antara sudut gesek internal hasil pengujian triaksial dengan kohesi hasil pengujian UCS dan indeks propertis tanah. Korelasi hubungan kohesi hasil uji triaksial dan hasil uji UCS dan indeks propertis sangat kuat dengan nilai kohesi yang diperoleh dari pengujian UCS sekitar 15% selalu lebih kecil dari pengujian triaksial.Kata kunci: kuat geser tanah, Unconfined Compression Strength, Triaksial, korelasi
Pemanfaatan Geopolimer Abu Terbang Sebagai Pozzolanic Tanah Lempung Untuk Material Tanah Dasar Perkerasan Soewignjo Agus Nugroho; Puspa Ningrum; Muhardi Muhardi
Jurnal Fondasi Vol 9, No 1 (2020)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jft.v9i1.7366

Abstract

California Bearing Ratio (CBR) is one of a method for determining soil bearing capacity. Extraction of industrial disposal to be used as material for road pavement construction is still lacking. This research aims to determine changing CBR values due to the fly ash addition in clay under conditions with or without curing and soaked.  Samples curing for 28 days were done in two conditions firstly, curing in mold and wrapped with plastic. Secondly, wrapped with plastic off mold. Looking at the CBR test results, plasticity index, density and specific gravity (Gs) is decreased. The addition of fly ash rises the value of the optimum water content (OMC). CBR value increased due to the addition of fly ash, a significantly increase occurred in the fly ash addition by 15%. Curing method uses different CBR values, where curing using mold has a high CBR value. In soaked CBR test, the CBR value varies due to the characteristics of the fly ash and clay which absorbed water. Water absorption varies depend on the percentage of the mixture of fly ash content and clay. The width variance of moisture content with OMC, because water absorption, affect to value of CBR. Samples with moisture content is more close to  OMC the CBR value is more bigger
Pengamatan Lendutan dan Rambatan Retak pada Perkerasan Lentur Diperkuat Geosintetik Akibat Beban Siklik Soewignjo Agus Nugroho; Inna Kurniati
Jurnal Teknik Sipil Vol 13 No 4 (2006)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2006.13.4.1

Abstract

Abstrak. Salah satu jenis kerusakan jalan adalah retak refleksi yaitu retak yang menggambarkan pola retakan di bawahnya. Retak ini terjadi karena perkerasan yang mengalami retak tidak diperbaiki dengan benar. Perbaikan yang dilakukan pada umumnya menutup retak dengan aspal cair sebelum pelaksanaan overlay. Penelitian ini bertujuan untuk mengetahui perilaku perkerasan lentur di laboratorium diperkuat dengan geosintetik serta pengaruh beban siklik pada lendutan di perkerasan lentur pada beberapa variasi kandungan aspal. Studi juga memperlihatkan bahwa pada kadar aspal optimum, bahan geotekstil paling mampu mereduksi besarnya lendutan dan kecepatan rambatan retak dibandingkan pada kadar aspal di bawah dan di atas kadar optimal.Abstract. Reflection crack is one type of road crack. Repairing is usually done by overlay. This research examined role of geosintetics as reinforcement in overlay of flexible pavement. This research is done by making a beam model made of aggregate and asphalt, representing flexible pavement. Models are tested with cyclic loads. Observation is focused on the influence of asphalt content and using geotextile to the rate of crack propagation. At optimum asphalt content, result shows that geosintetics reduces displacement and rate of crack propagation.
Studi Daya Dukung Pondasi Dangkal pada Tanah Gambut dengan Kombinasi Geotekstil dan Grid Bambu Soewignjo Agus Nugroho
Jurnal Teknik Sipil Vol 18 No 1 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2011.18.1.3

Abstract

Abstrak. Pembangunan konstruksi di atas tanah gambut mempunyai banyak masalah, diantaranya adalah daya dukung tanah yang rendah dan penurunan yang besar. Penggunaan kombinasi grid bambu dan geotekstil diharapkan akan dapat mengatasi masalah tersebut. Penelitian ini bertujuan mengetahui hubungan antara kapasitas daya dukung dengan variasi kedalaman letak perkuatan, lebar perkuatan, spasi antara grid bambu dan geotekstil, dan sudut penyebaran beban. Perbedaan daya dukung antara tanah tanpa perkuatan dengan menggunakan perkuatan dinyatakan dalam Bearing Capacity Ratio (BCR). Dari studi model di laboratorium diperoleh hasil BCR maksimum sebesar 4,32 pada rasio L/B, d/B, dan s/B berturut-turut adalah 3, 0,25 dan 0,5. Sudut penyebaran beban maksimum sebesar 78,79° pada L/B dan d/B (B adalah lebar pondasi) berturut-turut adalah 4 dan 0,25. Peningkatan BCR dan sudut penyaluran beban sebanding dengan penambahan dimensi perkuatan dan berbanding terbalik dengan jarak perkuatan dari dasar pondasi. Abstract. The construction on peat soil have many problems, Two significant problems are low bearing capacity and high construction settlement. The usage of grid bamboo and geotextile as a composite system is expected to overcome those problems. The purpose of this research is to check the relationship of bearing capacity with depth of the reinforcement layer, width reinforcement layer and spacing of reinforcement layers between of grid bamboo and geotextile, and to the angle of stresses distribution. The difference of the bearing capacity between unreinforced soils and reinforced soils referred as Bearing Capacity Ratio (BCR). From study model at laboratory the result indicate that maximum BCR is 4.32 at ratio L/B, d/B and s/B are increasing 3, 0.25, and 0.5. Maximum the angle of distribution is 78.79° at L/B and d/B (B is width of footing) are increasing 4 and 0.25. The increasing of BCR and angle of stress distribution is proportional by the increasing of reinforcement dimension and it diversely correlated with depth of reinforcement.
Value Estimation Of California Bearing Ratio From Hand Cone Penetrometer Test For Pekanbaru Soils Soewignjo Agus Nugroho; Muhammad Yusa; Syawal Satibi
Jurnal Teknik Sipil Vol 26 No 1 (2019)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2019.26.1.4

Abstract

In practice, the design of pavement is commonly based on the California Bearing Ratio (CBR) test. This research was performed to study local correlation between Hand Cone Penetrometer (HCP) tests to the field CBR value. The local correlation is determined based on comparisons of HCP and CBR test results for the same density of soil taken from several locations in Pekanbaru City, Indonesia. It was found that there is an approximate linear relation in log scale between HCP test results to CBR values for a certain density of soil. Correlation for HCP and density to CBR has been put forward for the local correlation between the two values. Verification of the formula shows that the correlation can be used relatively accurately for predicting the field CBR values from the HCP test for inorganic soils. For organic soil, the formula need to be further researched.Pada praktiknya, perancangan perkerasan jalan didasarkan pada tes California Bearing Ratio (CBR). Studi ini dilakukan untuk mengetahui korelasi lokal antara tes Hand Cone Penetrometer (HCP) dan tes CBR untuk tanah dengan berat jenis yang sama, yang diambil pada beberapa titik di kota Pekanbaru, Indonesia. Berdasarkan analisis, diketahui bahwa terdapat hubungan linear, dalam skala log, antara nilai tes HCP dan CBR untuk tanah dengan berat jenis tertentu. Studi ini kemudian mendefinisikan persamaan korelasi dari HCP dan berat jenis terhadap CBR untuk korelasi lokal antara nilai HCP dan CBR. Dari hasil verifikasi persamaan, diketahui bahwa persamaan korelasi tersebut cukup akurat dan dapat digunakan untuk memprediksi nilai CBR lapangan dengan menggunakan nilai tes HCP untuk tanah inorganik. Penelitian lebih lanjut perlu dilakukan untuk mendefinisikan formula korelasi untuk tanah organic. 
Prediksi Nilai SPT Pada Tanah Non Kohesif Berdasarkan Data CPT dan Sifat Fisik Tanah Menggunakan Jaringan Saraf Tiruan Soewignjo Agus Nugroho; Hendra Fernando; Reni Suryanita
Jurnal Teknik Sipil Vol 29 No 1 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.1.5

Abstract

Abstrak Standard Penetration Test (SPT) dan Cone Penetration Test (CPT) merupakan tes penyelidikan tanah awal yang sering digunakan saat memulai suatu konstruksi. Telah banyak penelitian sebelumnya yang membahas tentang korelasi linier antara nilai SPT dan CPT, namun nilai koefisien korelasinya (R2) cenderung kecil. Jaringan saraf tiruan (JST) merupakan teknik yang dapat memecahkan masalah yang kompleks dan non-linier. Pada penelitian ini akan dilakukan prediksi nilai SPT menggunakan jaringan saraf tiruan pada tanah granular menggunakan algoritma backpropagation. Panelitian ini menggunakan 117 data dari beberapa wilayah di Provinsi Riau. Data masukan yang digunakan berupa nilai tahanan ujung (qc) dan nilai tahanan selimut (fs) dari pengujian CPT dan nilai tekanan overburden efektif (σ'0) serta persentase pasir dan butiran halus. JST dianggap efektif dalam penelitian ini dengan nilai RMSE 3,646, MAE 2,533 dan R2 0,9103 untuk data latih dan RMSE 2,955, MAE 2,190, R2 0,9311 untuk data uji. Selanjutnya model JST ini disebut sebagai NN_Nspt (NC). Kata-kata Kunci: back-propagation, CPT, granular, Jaringan Saraf Tiruan, SPT Abstract The Standard Penetration Test (SPT) and the Cone Penetration Test (CPT) are kinds of Soil Investigation Tests that are used to determine bearing capacity and soil parameters for designing a construction. There are many previous studies had been defined the linear correlation between SPT and CPT values. However, the linear correlation predisposed get correlation coefficient (R2) small. Artificial neural networks (ANN) is an Artificial Intelligence model that can solve complex and non-linear problems. This research aims to conduct SPT value prediction using ANN in granular soil (non-cohesive) with a backpropagation algorithm function. This study used 117 data taken from several provinces on Sumatera island. The variables of input data are taken from CPT, i.e cone resistance (qc)and sleeve resistance (fs), and from the UDS test. The laboratory data were effective overburden pressure (σ‘0), the percentage of sand, and the percentage of fine grain. The best ANN model had a single hidden layer and 40 neurons with RMSE values 3.646, MAE 2.533, and R2 0.9103 for training data and RMSE 2.955, MAE 2.190, R2 0.9311 for testing data. Thus, the best ANN model has been proposed as NN_Nspt (NC). Keywords: Artificial Neuron Network, back-propagation, CPT, granular, SPT
Perbaikan Sifat Geoteknik Tanah Lunak Lempung (CH) Terhadap Penambahan Semen Dan Limbah Bottom Ash Aditia Siringoringo; Soewignjo Agus Nugroho; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The work built on the land which high plasticity clay (CH) that has a relatively low carrying capacity will have a short service life. To overcome this problem, efforts are made to improve the geotechnical properties of the soil by stabilizing using bottom ash (coal waste) and cement. The addition of this mixture aims to determine its effect in efforts to improve the physical and mechanical properties of high plasticity (CH) clay. The sample making in this research is based on the variation of bottom ash mixture 5%, 10%, 15% and the variation of the cement mixture is 3% and 5% of the dry weight of the soil. The UCS test was carried out as a reference to see the effect of using a mixture of bottom ash and cement. Testing of UCS samples was carried out based on curing time, with the following curing variations, without curing, 7 days and 28 days. Based on the results of the original soil UCS test, the Cu value is 10.55 kPa and the best mixed soil test value is in the variation of the soil mixture L-S5-BA15-C28 with a Cu value of 30.71 kPa. The conclusion from the research proved that the addition of a mixture of bottom ash and cement was able to increase the Cu value by 291.09% at 15% bottom ash content and 5% cement with a curing time of 28 days. Keywords : Bottom Ash, Cement, UCS, stabilization.
Pengaruhdiameter Pelathelical Terhadap Dayadukung Tekan Pondasi Tianghelical Pada Tanah Gambut Dengan Metoda Pembebananconstant Stress Of Penetration Unzi Marwan; Ferry Fatnanta; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Foundation type selection is very influential on the building strength. One alternative of foundation type substitute for cerucuk is helical pile. Helical pile manufactured of steel consist of one or more helix-shaped bearing plates fixed to a central shaft that is rotated into the ground to support structure. This research presented the result of static loadingtest of helical pile on peat with constant stress penetration method. Datas of loading test in the form of load and penetration interpretation with Tangent of Intersection method and Terzaghi and Peck method. Pile variation in number and diameter of helix was conducted.Results indicate that addition of number helical will improve bearing capacity of helical pile. At pile that add with different helix's diameter, addition plate helical not affect significant to pile capacity for smaller diameter position on bottom. Comparison staticload test with empirical methods i.e method of Induvidual plate bearing and cylinder shear bearing. To sum up, cylinder shear bearing method more suite to static loading test than individual plate bearing method wiith standar error 0,79 and 1,79 respectivelly.Key words: helical pile, peat, individual plate bearing, cylinder shear
Stabilisasi Tanah Lempung Dengan Pasir Bermacam Gradasi Dan Campuran Kapur M. Shoffar Al Hafizh; Gunawan Wibisono; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Unconfined compression strength and CBR values of sandy clay are influenced by several factor such as sand and clay content, soil properties, density, moisture content, and gradation. This research tries to figure out the effect of sandy clay gradation on its unconfined compression strength and CBR values. Sandy clay mixtures were made from different percentage of sand and clay fractions. Sand fraction gradation varied from well to poor (gap). Clay was also stabilized with quick lime. The results of this research indicated that the addition of sand and lime into clay increased unconfined compression strength and CBR values, especially after 28 days curing time. The largest value of unconfined compression strength test occurred at mixture with 70% clay, due to the cohesiveness obtained from clay and lime stabilisation. The largest CBR values were found in the mixture with less contained clay.Keywords: unconfined compression strength,CBR, gradation, density, sand, clay
Potensi Likuifaksi Tanah Pasir Di Atas Tanah Lunak Dengan Variasi Tebal Timbunan Pasir Melalui Uji Model Laboratorium Bahrul Junaidi; Agus Ika Putra; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Buildings in Riau, especially Pekanbaru City, are generally established on peatlands covered in sand embankment. Earthquakes often occur in the western region of the island of Sumatra due to its position along with two tectonic plate collision of earth, Indian and Eurasian plate. One of earthquake activity aftermath is liquefaction. Liquefaction can be defined as the loss of shear strength of soil due to an increase in excess pore water pressure caused by cyclical load, therefore the total stress of ground is almost entirely replaced by pore water pressure. The aim of this research is to know the influence of embankment thickness and acceleration of vibration against pore water pressure increment and soil settlement. This research was conducted by laboratory model test using shaking table. The acceleration variation used were 0.25 g and 0.32 g. The thickness variation of sand embankment used were 10 cm, 15 cm, and 20 cm placed on a 10 cm peat soil layer and given a load 40 kg/m2. Water level elevation as high as the sand layer each variation. The results of this research show that with the addition of the sand embankment thickness takes longer time to reach maximum pore water pressure increment. The thicker of sand embankment take longer time to reach maximum soil settlement during liquefaction. The addition of acceleration values leads to larger increment of pore water pressure and soil settlement, but the time it takes for pore water pressure begin to stabilize tends to be faster.Keyword : Liquefaction, embankment, peat soil, excess pore water pressure, shaking table
Co-Authors ', Muhardi Aditia Siringoringo Adnan Ruziq Ihsan Agus Ika Putra Agus Ika Putra Alridho, Muhammad Faizal Andarsin Ongko Andius Dasa Putra Ari S. Sibarani Ari S. Sibarani Ari Sandhyavitri Ari Sandhyavitri Arie S Sibarani Arie S Sibarani Arisman Adnan Avrilly Zesthree Mauliza Azra Zulnasari Bahrul Junaidi Bambang Sujatmoko Enno Yuniarto Erik Azarya Ginting Ermiyati Fadhilah, Randy Fajar Restuhadi Fakhri, Fakhri Febrizal Ujang Ferry Fatnanta Fikri Hidayat Giri Prayoga Gunawan Wibisono Gunawan Wibisono Gussyafri Hendra Fernando Ihsan, Adnan Ruziq Imam Suprayogi Inna Kurniati Inna Kurniati, Inna Irfan Hasan Jamili, M Joehari K Khairat Khairatu Zaro Khairul Umam Lala Monang Robert Christian Zega Lala Monang Robert Christian Zega Zega Lembasi, Muhammad Khadafi Lingga Panji Subrata, Lingga Panji M Faizal Alridho M. Shoffar Al Hafizh M. Yusuf Agustamar Mamoru Kikumoto Mohammad Saeri Monita Olivia Muhamad Yusa Muhammad Faisal Al Ridho Muhammad Khadafi Lembasi Muhammad Muhshi Muhammad Yusa Muhardi Muhardi Muhardi Novan, Andre Nurdin Nurdin Ongko, Andarsin Prayogo, Giri Puspa Ningrum Raflyatullah Raflyatullah Raflyatullah, Raflyatullah Randhi Saily Reni Suryanita Rian Trikomara Iriana Rofika Ratna Ardiansyah Roni Indra Lesmana Rosma, Iswadi Hasyim Rudy Suryadi, Rudy Rugun Ermina S. Siswanto Safridatul Audah Saputra, Riola Satibi, Syawal Sayoga, Davin Syamsu Herman Syamsul Arifin Unzi Marwan Usman, Fauzan Wulandari, Deny Zega, Christian Robert Zoni Satria Zulnasari, Azra